Try detect physical address space, when successful use it.
Otherwise go continue using the current guesswork code path.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
OvmfPkg/Library/PlatformInitLib/MemDetect.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
index 143a01ceb01e..16ecbfadc30c 100644
--- a/OvmfPkg/Library/PlatformInitLib/MemDetect.c
+++ b/OvmfPkg/Library/PlatformInitLib/MemDetect.c
@@ -761,6 +761,19 @@ PlatformAddressWidthInitialization (
FirstNonAddress = PlatformGetFirstNonAddress (PlatformInfoHob);
}
+ PlatformAddressWidthFromCpuid (PlatformInfoHob, TRUE);
+ if (PlatformInfoHob->PhysMemAddressWidth != 0) {
+ // physical address width is known
+ PlatformInfoHob->FirstNonAddress = FirstNonAddress;
+ return;
+ }
+
+ //
+ // physical address width is NOT known
+ // -> do some guess work, mostly based on installed memory
+ // -> try be conservstibe to stay below the guaranteed minimum of
+ // 36 phys bits (aka 64 GB).
+ //
PhysMemAddressWidth = (UINT8)HighBitSet64 (FirstNonAddress);
//
--
2.37.3
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